/// <summary>
        /// This method will be invoked by the class for which
        /// validation is performed
        /// </summary>
        /// <param name="message">Some message about validation</param>
        /// <param name="isValid">Is the worksheet is valid and error free</param>
        public void ValidationCompleted(string message, bool isValid)
        {
            btnCancel.IsEnabled     = true;
            btnBrowseFile.IsEnabled = true;
            txtOut.Cursor           = Cursors.Arrow;
            this.Cursor             = Cursors.Arrow;
            lblTitle.Content        = "Validation completed";

            if (isValid)
            {
                if (MessageBox.Show(message, "Validation Result", MessageBoxButton.YesNo, MessageBoxImage.Information) == MessageBoxResult.Yes)
                {
                    btnBrowseFile.IsEnabled = false;
                    btnCancel.IsEnabled     = false;
                    txtOut.Cursor           = Cursors.Wait;
                    this.Cursor             = Cursors.Wait;
                    lblTitle.Content        = "Pushing information to database.";

                    //perferom database update
                    prgsbar.Value = 0;
                    cat.PushToDatabase(fileName);
                }
            }
            else
            {
                MessageBox.Show(message, "Validation Result", MessageBoxButton.OK, MessageBoxImage.Exclamation);
            }
        }